I don’t do F/B but I know several people who do. Several have two identities, using a fake name for different things. For example, a friend of mine works in a private security job. She uses a fake name to investigate sex crimes on behalf of victims’ parents. Bottom line - F/B is full of fake identities/personalities and unless you are SURE who you are talking with, you should assume they are make believe, and possibly dangerous.
My dog has an account on Facebook. He posts pictures occasionally.